Electronics Repair Questions? Ask an Electronics Technician
First check the battery terminals and make sure they are clean and shiny, then use a couble of store bought Alkaline non rechargable batteries and tell me how you get on?
Sorry stepped away... Fellow ham here, ZL1BTL
It shouldn't be too hard to follow the voltage path using a multimeter until it disappears, but there are a lot of things that an cause the receiver to just stop, in my experience it is unlikely to be the regulator but it is easy enough to check...